Storage of carbon dioxide on a large scale in oil fields

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Government of Canada, 07 / 09 / 2004

EnCana has managed to produce more oil when carbon dioxide (CO2) was injected into the geological formations and the oil mele. Thus, the Weyburn field, operated since 50 years in southeastern Saskatchewan by the company from Calgary, allowed to store some five million tons of CO2.
A report concludes that the Weyburn oil field to be very good at long-term storage of CO2 because of its geological characteristics. ENAA (Japan), Nexen, SaskPower, TransAlta and Total (France) took part in a multidisciplinary study, for a period of four years, which has cost 40 million Canadian dollars. During the study, the researchers realized a risk evaluation of the long-term storage, completed the geological and seismic studies, environmental modeling comparing the actual results and makes repeated and frequent levies to try to understand the chemical reactions occurring in The reservoir.
This study proves that one can store tons of 5.000 CO2 daily in the ground and limit the release of this greenhouse gas in the atmosphere. However, CO2 was used by a pipeline routes 325 kilometers and came from a gasification plant Coal of North Dakota. This shows the limits of the project since it remains easier to manufacture than CO2 trap, store and transport issued by the polluting activities. Moreover, much remains to be done to apply the techniques and systems employed here are other geological formations around the world and ensure that storage CO2 becomes really an option to reduce the gas emissions effect greenhouse.

Note econology:
See the order of magnitude of releases of humanity CO2:

- Current daily consumption is 80 million barrels of oil
- 85% of this oil is consumed as energy (ie burnt)
- 1 kg of oil burned rejected, envion and to simplify the calculations, 2.5 kg CO2
- A barrel of oil contains 159 L
- The density of the oil is about 800 kg / m3

So there 80 0.85 * * * 159 0.8 8650 = Millions of kilograms of oil burned daily.
D'or discharges of CO2: 8650 2.5 * = 21 600 Million kg ... or 21 Million Tons.

It would be interesting to compare this figure with the absorption of quotienne CO2 biomass (plants and plankton essentially).

Obviously this figure only takes into account the oil releases, not the CO2 releases of other fossil fuels (gas and coal). The "big scale" mentioned in the title is therefore hardly credible ... for now.

A more effective solution would it not reduce the oil consumption just? By increasing the process conversion efficiency ... for example.


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